I cannot see what is wrong, but after saving each figure you should
add plt.clf() in order to delete the image and preventing memory
leaks, because MPL stores one image in top of the other.
For the filecode I suggest you to use something like:
savefig(head+str(filecode).zfill(digits)+format, dpi=205)
filecode+=1
where head is the name, digits an int and format usually .png.
Which backend are you using? Do you need it to be displayed on screen?
If not, the backend Agg is best.
Regards,
David.
On Wed, Aug 25, 2010 at 5:28 AM, David Pine <djp...@gmail.com> wrote:
> I am trying to save the frames from a matplotlib animation and I have a
> question that is undoubtedly based on a profound lack of understanding about
> how matplotlib/python works, but I'm hoping someone can offer me an
> explanation. The following code is excerpted from the animation examples
> "animation_blit_wx.py". The example works fine unless I include the #*****
> line meant to record the animations in included. If the line is included,
> the animated line is no longer drawn to the screen or to the sequence of
> plots I am trying to save. That is, the background is displayed and saved,
> but not the animated line. Why?
>
>
> def update_line(*args):
> global blit_time
>
> if update_line.background is None:
> update_line.background = canvas.copy_from_bbox(ax.bbox)
>
> # restore the clean slate background
> canvas.restore_region(update_line.background)
> # update the data
> line.set_ydata(npy.sin(x+update_line.cnt/10.0))
> # just draw the animated artist
> ax.draw_artist(line)
> # just redraw the axes rectangle
>
> t = time.time()
> canvas.blit(ax.bbox)
> blit_time += time.time() - t
> #***** plt.savefig('f' + str(update_line.cnt) + '.png') *****
>
> if update_line.cnt == NBLITS:
> # print the timing info and quit
> frame_time = time.time() - tstart
> print '%d frames: %.2f seconds' % (NBLITS, frame_time)
> print '%d blits: %.2f seconds' % (NBLITS, blit_time)
> print
> print 'FPS: %.2f' % (NBLITS/frame_time)
> print 'BPS: %.2f' % (NBLITS/blit_time)
> sys.exit()
>
> update_line.cnt += 1
> wx.WakeUpIdle()
>
>
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